replace-empty-strings-null.md

Replace empty strings with NULLs

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Description

An essential part of cleaning a new data source is deciding how to treat missing values. The Snowflake function IFF can help with replacing empty values with something else:

with data as (
  select * from (values ('a'), ('b'), (''), ('d')) as data (str)
)

select
  iff(length(str) = 0, null, str) str
from data

STR
a
b
NULL
d